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   1 /*
   2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible or what?!?!
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/mm.h>
  11 #include <linux/errno.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/time.h>
  15 #include <linux/ptrace.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19
  20 #undef DEBUG_SIG
  21
  22 #define _S(nr) (1<<((nr)-1))
  23
  24 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  25
  26 typedef struct {
  27         unsigned long sig[4];
  28 } irix_sigset_t;
  29
  30 struct sigctx_irix5 {
  31         u32 rmask, cp0_status;
  32         u64 pc;
  33         u64 regs[32];
  34         u64 fpregs[32];
  35         u32 usedfp, fpcsr, fpeir, sstk_flags;
  36         u64 hi, lo;
  37         u64 cp0_cause, cp0_badvaddr, _unused0;
  38         irix_sigset_t sigset;
  39         u64 weird_fpu_thing;
  40         u64 _unused1[31];
  41 };
  42
  43 #ifdef DEBUG_SIG
  44 /* Debugging */
  45 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  46 {
  47         int i;
  48
  49         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  50                (unsigned long) c->rmask,
  51                (unsigned long) c->cp0_status,
  52                (unsigned long) c->pc);
  53         printk("regs: ");
  54         for(i = 0; i < 16; i++)
  55                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  56         printk("\nregs: ");
  57         for(i = 16; i < 32; i++)
  58                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  59         printk("\nfpregs: ");
  60         for(i = 0; i < 16; i++)
  61                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  62         printk("\nfpregs: ");
  63         for(i = 16; i < 32; i++)
  64                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  65         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  66                (int) c->usedfp, (unsigned long) c->fpcsr,
  67                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  68         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  69                (unsigned long) c->hi, (unsigned long) c->lo,
  70                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  71         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  72                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  73                (unsigned long) c->sigset.sig[1],
  74                (unsigned long) c->sigset.sig[2],
  75                (unsigned long) c->sigset.sig[3]);
  76 }
  77 #endif
  78
  79 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  80                             int signr, sigset_t *oldmask)
  81 {
  82         struct sigctx_irix5 __user *ctx;
  83         unsigned long sp;
  84         int error, i;
  85
  86         sp = regs->regs[29];
  87         sp -= sizeof(struct sigctx_irix5);
  88         sp &= ~(0xf);
  89         ctx = (struct sigctx_irix5 __user *) sp;
  90         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  91                 goto segv_and_exit;
  92
  93         error = __put_user(0, &ctx->weird_fpu_thing);
  94         error |= __put_user(~(0x00000001), &ctx->rmask);
  95         error |= __put_user(0, &ctx->regs[0]);
  96         for(i = 1; i < 32; i++)
  97                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
  98
  99         error |= __put_user((u64) regs->hi, &ctx->hi);
 100         error |= __put_user((u64) regs->lo, &ctx->lo);
 101         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 102         error |= __put_user(!!used_math(), &ctx->usedfp);
 103         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 104         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 105
 106         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 107
 108         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 109
 110         if (error)
 111                 goto segv_and_exit;
 112
 113 #ifdef DEBUG_SIG
 114         dump_irix5_sigctx(ctx);
 115 #endif
 116
 117         regs->regs[4] = (unsigned long) signr;
 118         regs->regs[5] = 0; /* XXX sigcode XXX */
 119         regs->regs[6] = regs->regs[29] = sp;
 120         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 121         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 122
 123         return 1;
 124
 125 segv_and_exit:
 126         force_sigsegv(signr, current);
 127         return 0;
 128 }
 129
 130 static int inline
 131 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 132                int signr, sigset_t *oldmask, siginfo_t *info)
 133 {
 134         printk("Aiee: setup_tr_frame wants to be written");
 135         do_exit(SIGSEGV);
 136 }
 137
 138 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 139         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 140 {
 141         int ret;
 142
 143         switch(regs->regs[0]) {
 144         case ERESTARTNOHAND:
 145                 regs->regs[2] = EINTR;
 146                 break;
 147         case ERESTARTSYS:
 148                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 149                         regs->regs[2] = EINTR;
 150                         break;
 151                 }
 152         /* fallthrough */
 153         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 154                 regs->cp0_epc -= 8;
 155         }
 156
 157         regs->regs[0] = 0;              /* Don't deal with this again.  */
 158
 159         if (ka->sa.sa_flags & SA_SIGINFO)
 160                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 161         else
 162                 ret = setup_irix_frame(ka, regs, sig, oldset);
 163
 164         spin_lock_irq(&current->sighand->siglock);
 165         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 166         if (!(ka->sa.sa_flags & SA_NODEFER))
 167                 sigaddset(&current->blocked,sig);
 168         recalc_sigpending();
 169         spin_unlock_irq(&current->sighand->siglock);
 170
 171         return ret;
 172 }
 173
 174 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 175 {
 176         struct k_sigaction ka;
 177         siginfo_t info;
 178         int signr;
 179
 180         /*
 181          * We want the common case to go fast, which is why we may in certain
 182          * cases get here from kernel mode. Just return without doing anything
 183          * if so.
 184          */
 185         if (!user_mode(regs))
 186                 return 1;
 187
 188         if (try_to_freeze())
 189                 goto no_signal;
 190
 191         if (!oldset)
 192                 oldset = &current->blocked;
 193
 194         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 195         if (signr > 0)
 196                 return handle_signal(signr, &info, &ka, oldset, regs);
 197
 198 no_signal:
 199         /*
 200          * Who's code doesn't conform to the restartable syscall convention
 201          * dies here!!!  The li instruction, a single machine instruction,
 202          * must directly be followed by the syscall instruction.
 203          */
 204         if (regs->regs[0]) {
 205                 if (regs->regs[2] == ERESTARTNOHAND ||
 206                     regs->regs[2] == ERESTARTSYS ||
 207                     regs->regs[2] == ERESTARTNOINTR) {
 208                         regs->cp0_epc -= 8;
 209                 }
 210         }
 211         return 0;
 212 }
 213
 214 asmlinkage void
 215 irix_sigreturn(struct pt_regs *regs)
 216 {
 217         struct sigctx_irix5 __user *context, *magic;
 218         unsigned long umask, mask;
 219         u64 *fregs;
 220         u32 usedfp;
 221         int error, sig, i, base = 0;
 222         sigset_t blocked;
 223
 224         /* Always make any pending restarted system calls return -EINTR */
 225         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 226
 227         if (regs->regs[2] == 1000)
 228                 base = 1;
 229
 230         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
 231         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
 232         sig = (int) regs->regs[base + 6];
 233 #ifdef DEBUG_SIG
 234         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 235                current->comm, current->pid, context, magic, sig);
 236 #endif
 237         if (!context)
 238                 context = magic;
 239         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 240                 goto badframe;
 241
 242 #ifdef DEBUG_SIG
 243         dump_irix5_sigctx(context);
 244 #endif
 245
 246         error = __get_user(regs->cp0_epc, &context->pc);
 247         error |= __get_user(umask, &context->rmask);
 248
 249         mask = 2;
 250         for (i = 1; i < 32; i++, mask <<= 1) {
 251                 if (umask & mask)
 252                         error |= __get_user(regs->regs[i], &context->regs[i]);
 253         }
 254         error |= __get_user(regs->hi, &context->hi);
 255         error |= __get_user(regs->lo, &context->lo);
 256
 257         error |= __get_user(usedfp, &context->usedfp);
 258         if ((umask & 1) && usedfp) {
 259                 fregs = (u64 *) &current->thread.fpu;
 260
 261                 for(i = 0; i < 32; i++)
 262                         error |= __get_user(fregs[i], &context->fpregs[i]);
 263                 error |= __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
 264         }
 265
 266         /* XXX do sigstack crapola here... XXX */
 267
 268         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 269
 270         if (error)
 271                 goto badframe;
 272
 273         sigdelsetmask(&blocked, ~_BLOCKABLE);
 274         spin_lock_irq(&current->sighand->siglock);
 275         current->blocked = blocked;
 276         recalc_sigpending();
 277         spin_unlock_irq(&current->sighand->siglock);
 278
 279         /*
 280          * Don't let your children do this ...
 281          */
 282         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
 283                 do_syscall_trace(regs, 1);
 284         __asm__ __volatile__(
 285                 "move\t$29,%0\n\t"
 286                 "j\tsyscall_exit"
 287                 :/* no outputs */
 288                 :"r" (&regs));
 289                 /* Unreached */
 290
 291 badframe:
 292         force_sig(SIGSEGV, current);
 293 }
 294
 295 struct sigact_irix5 {
 296         int flags;
 297         void (*handler)(int);
 298         u32 sigset[4];
 299         int _unused0[2];
 300 };
 301
 302 #ifdef DEBUG_SIG
 303 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 304 {
 305         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 306                (unsigned long) p->handler,
 307                (unsigned long) p->sigset[0]);
 308 }
 309 #endif
 310
 311 asmlinkage int
 312 irix_sigaction(int sig, const struct sigaction __user *act,
 313               struct sigaction __user *oact, void __user *trampoline)
 314 {
 315         struct k_sigaction new_ka, old_ka;
 316         int ret;
 317
 318 #ifdef DEBUG_SIG
 319         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 320                (!old ? "0" : "OLD"), trampoline);
 321         if(new) {
 322                 dump_sigact_irix5(new); printk(" ");
 323         }
 324 #endif
 325         if (act) {
 326                 sigset_t mask;
 327                 int err;
 328
 329                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 330                         return -EFAULT;
 331                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 332                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 333
 334                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 335                 if (err)
 336                         return err;
 337
 338                 /*
 339                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 340                  * value for all invocations of sigaction.  Will have to
 341                  * investigate.  POSIX POSIX, die die die...
 342                  */
 343                 new_ka.sa_restorer = trampoline;
 344         }
 345
 346 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 347         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 348
 349         if (!ret && oact) {
 350                 int err;
 351
 352                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 353                         return -EFAULT;
 354
 355                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 356                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 357                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 358                                sizeof(sigset_t)) ? -EFAULT : 0;
 359                 if (err)
 360                         return -EFAULT;
 361         }
 362
 363         return ret;
 364 }
 365
 366 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 367 {
 368         return do_sigpending(set, sizeof(*set));
 369 }
 370
 371 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 372         irix_sigset_t __user *old)
 373 {
 374         sigset_t oldbits, newbits;
 375
 376         if (new) {
 377                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 378                         return -EFAULT;
 379                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 380                         return -EFAULT;
 381                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 382
 383                 spin_lock_irq(&current->sighand->siglock);
 384                 oldbits = current->blocked;
 385
 386                 switch(how) {
 387                 case 1:
 388                         sigorsets(&newbits, &oldbits, &newbits);
 389                         break;
 390
 391                 case 2:
 392                         sigandsets(&newbits, &oldbits, &newbits);
 393                         break;
 394
 395                 case 3:
 396                         break;
 397
 398                 case 256:
 399                         siginitset(&newbits, newbits.sig[0]);
 400                         break;
 401
 402                 default:
 403                         return -EINVAL;
 404                 }
 405                 recalc_sigpending();
 406                 spin_unlock_irq(&current->sighand->siglock);
 407         }
 408         if (old)
 409                 return copy_to_user(old, &current->blocked,
 410                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 411
 412         return 0;
 413 }
 414
 415 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 416 {
 417         sigset_t saveset, newset;
 418         sigset_t __user *uset;
 419
 420         uset = (sigset_t __user *) regs->regs[4];
 421         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 422                 return -EFAULT;
 423         sigdelsetmask(&newset, ~_BLOCKABLE);
 424
 425         spin_lock_irq(&current->sighand->siglock);
 426         saveset = current->blocked;
 427         current->blocked = newset;
 428         recalc_sigpending();
 429         spin_unlock_irq(&current->sighand->siglock);
 430
 431         regs->regs[2] = -EINTR;
 432         while (1) {
 433                 current->state = TASK_INTERRUPTIBLE;
 434                 schedule();
 435                 if (do_irix_signal(&saveset, regs))
 436                         return -EINTR;
 437         }
 438 }
 439
 440 /* hate hate hate... */
 441 struct irix5_siginfo {
 442         int sig, code, error;
 443         union {
 444                 char unused[128 - (3 * 4)]; /* Safety net. */
 445                 struct {
 446                         int pid;
 447                         union {
 448                                 int uid;
 449                                 struct {
 450                                         int utime, status, stime;
 451                                 } child;
 452                         } procdata;
 453                 } procinfo;
 454
 455                 unsigned long fault_addr;
 456
 457                 struct {
 458                         int fd;
 459                         long band;
 460                 } fileinfo;
 461
 462                 unsigned long sigval;
 463         } stuff;
 464 };
 465
 466 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 467         struct irix5_siginfo __user *info, struct timespec __user *tp)
 468 {
 469         long expire = MAX_SCHEDULE_TIMEOUT;
 470         sigset_t kset;
 471         int i, sig, error, timeo = 0;
 472         struct timespec ktp;
 473
 474 #ifdef DEBUG_SIG
 475         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 476                current->comm, current->pid, set, info, tp);
 477 #endif
 478
 479         /* Must always specify the signal set. */
 480         if (!set)
 481                 return -EINVAL;
 482
 483         if (copy_from_user(&kset, set, sizeof(set)))
 484                 return -EFAULT;
 485
 486         if (info && clear_user(info, sizeof(*info))) {
 487                 error = -EFAULT;
 488                 goto out;
 489         }
 490
 491         if (tp) {
 492                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 493                         return -EFAULT;
 494
 495                 if (!ktp.tv_sec && !ktp.tv_nsec)
 496                         return -EINVAL;
 497
 498                 expire = timespec_to_jiffies(&ktp) +
 499                          (ktp.tv_sec || ktp.tv_nsec);
 500         }
 501
 502         while(1) {
 503                 long tmp = 0;
 504
 505                 expire = schedule_timeout_interruptible(expire);
 506
 507                 for (i=0; i<=4; i++)
 508                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 509
 510                 if (tmp)
 511                         break;
 512                 if (!expire) {
 513                         timeo = 1;
 514                         break;
 515                 }
 516                 if (signal_pending(current))
 517                         return -EINTR;
 518         }
 519         if (timeo)
 520                 return -EAGAIN;
 521
 522         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 523                 if (sigismember (&kset, sig))
 524                         continue;
 525                 if (sigismember (&current->pending.signal, sig)) {
 526                         /* XXX need more than this... */
 527                         if (info)
 528                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 529                         return 0;
 530                 }
 531         }
 532
 533         /* Should not get here, but do something sane if we do. */
 534         error = -EINTR;
 535
 536 out:
 537         return error;
 538 }
 539
 540 /* This is here because of irix5_siginfo definition. */
 541 #define IRIX_P_PID    0
 542 #define IRIX_P_PGID   2
 543 #define IRIX_P_ALL    7
 544
 545 extern int getrusage(struct task_struct *, int, struct rusage __user *);
 546
 547 #define W_EXITED     1
 548 #define W_TRAPPED    2
 549 #define W_STOPPED    4
 550 #define W_CONT       8
 551 #define W_NOHANG    64
 552
 553 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 554
 555 asmlinkage int irix_waitsys(int type, int pid,
 556         struct irix5_siginfo __user *info, int options,
 557         struct rusage __user *ru)
 558 {
 559         int flag, retval;
 560         DECLARE_WAITQUEUE(wait, current);
 561         struct task_struct *tsk;
 562         struct task_struct *p;
 563         struct list_head *_p;
 564
 565         if (!info)
 566                 return -EINVAL;
 567
 568         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 569                 return -EFAULT;
 570
 571         if (ru)
 572                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 573                         return -EFAULT;
 574
 575         if (options & ~W_MASK)
 576                 return -EINVAL;
 577
 578         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 579                 return -EINVAL;
 580
 581         add_wait_queue(&current->signal->wait_chldexit, &wait);
 582 repeat:
 583         flag = 0;
 584         current->state = TASK_INTERRUPTIBLE;
 585         read_lock(&tasklist_lock);
 586         tsk = current;
 587         list_for_each(_p,&tsk->children) {
 588                 p = list_entry(_p,struct task_struct,sibling);
 589                 if ((type == IRIX_P_PID) && p->pid != pid)
 590                         continue;
 591                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 592                         continue;
 593                 if ((p->exit_signal != SIGCHLD))
 594                         continue;
 595                 flag = 1;
 596                 switch (p->state) {
 597                 case TASK_STOPPED:
 598                         if (!p->exit_code)
 599                                 continue;
 600                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 601                             !(p->ptrace & PT_PTRACED))
 602                                 continue;
 603                         read_unlock(&tasklist_lock);
 604
 605                         /* move to end of parent's list to avoid starvation */
 606                         write_lock_irq(&tasklist_lock);
 607                         remove_parent(p);
 608                         add_parent(p, p->parent);
 609                         write_unlock_irq(&tasklist_lock);
 610                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 611                         if (retval)
 612                                 goto end_waitsys;
 613
 614                         retval = __put_user(SIGCHLD, &info->sig);
 615                         retval |= __put_user(0, &info->code);
 616                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 617                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 618                                    &info->stuff.procinfo.procdata.child.status);
 619                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 620                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 621                         if (retval)
 622                                 goto end_waitsys;
 623
 624                         p->exit_code = 0;
 625                         goto end_waitsys;
 626
 627                 case EXIT_ZOMBIE:
 628                         current->signal->cutime += p->utime + p->signal->cutime;
 629                         current->signal->cstime += p->stime + p->signal->cstime;
 630                         if (ru != NULL)
 631                                 getrusage(p, RUSAGE_BOTH, ru);
 632                         retval = __put_user(SIGCHLD, &info->sig);
 633                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 634                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 635                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 636                                    &info->stuff.procinfo.procdata.child.status);
 637                         retval |= __put_user(p->utime,
 638                                    &info->stuff.procinfo.procdata.child.utime);
 639                         retval |= __put_user(p->stime,
 640                                    &info->stuff.procinfo.procdata.child.stime);
 641                         if (retval)
 642                                 return retval;
 643
 644                         if (p->real_parent != p->parent) {
 645                                 write_lock_irq(&tasklist_lock);
 646                                 remove_parent(p);
 647                                 p->parent = p->real_parent;
 648                                 add_parent(p, p->parent);
 649                                 do_notify_parent(p, SIGCHLD);
 650                                 write_unlock_irq(&tasklist_lock);
 651                         } else
 652                                 release_task(p);
 653                         goto end_waitsys;
 654                 default:
 655                         continue;
 656                 }
 657                 tsk = next_thread(tsk);
 658         }
 659         read_unlock(&tasklist_lock);
 660         if (flag) {
 661                 retval = 0;
 662                 if (options & W_NOHANG)
 663                         goto end_waitsys;
 664                 retval = -ERESTARTSYS;
 665                 if (signal_pending(current))
 666                         goto end_waitsys;
 667                 current->state = TASK_INTERRUPTIBLE;
 668                 schedule();
 669                 goto repeat;
 670         }
 671         retval = -ECHILD;
 672 end_waitsys:
 673         current->state = TASK_RUNNING;
 674         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 675
 676         return retval;
 677 }
 678
 679 struct irix5_context {
 680         u32 flags;
 681         u32 link;
 682         u32 sigmask[4];
 683         struct { u32 sp, size, flags; } stack;
 684         int regs[36];
 685         u32 fpregs[32];
 686         u32 fpcsr;
 687         u32 _unused0;
 688         u32 _unused1[47];
 689         u32 weird_graphics_thing;
 690 };
 691
 692 asmlinkage int irix_getcontext(struct pt_regs *regs)
 693 {
 694         int error, i, base = 0;
 695         struct irix5_context __user *ctx;
 696         unsigned long flags;
 697
 698         if (regs->regs[2] == 1000)
 699                 base = 1;
 700         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 701
 702 #ifdef DEBUG_SIG
 703         printk("[%s:%d] irix_getcontext(%p)\n",
 704                current->comm, current->pid, ctx);
 705 #endif
 706
 707         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 708                 return -EFAULT;
 709
 710         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 711
 712         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 713
 714         /* XXX Do sigstack stuff someday... */
 715         error |= __put_user(0, &ctx->stack.sp);
 716         error |= __put_user(0, &ctx->stack.size);
 717         error |= __put_user(0, &ctx->stack.flags);
 718
 719         error |= __put_user(0, &ctx->weird_graphics_thing);
 720         error |= __put_user(0, &ctx->regs[0]);
 721         for (i = 1; i < 32; i++)
 722                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 723         error |= __put_user(regs->lo, &ctx->regs[32]);
 724         error |= __put_user(regs->hi, &ctx->regs[33]);
 725         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 726         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 727
 728         flags = 0x0f;
 729         if (!used_math()) {
 730                 flags &= ~(0x08);
 731         } else {
 732                 /* XXX wheee... */
 733                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 734         }
 735         error |= __put_user(flags, &ctx->flags);
 736
 737         return error;
 738 }
 739
 740 asmlinkage void irix_setcontext(struct pt_regs *regs)
 741 {
 742         struct irix5_context __user *ctx;
 743         int err, base = 0;
 744         u32 flags;
 745
 746         if (regs->regs[2] == 1000)
 747                 base = 1;
 748         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 749
 750 #ifdef DEBUG_SIG
 751         printk("[%s:%d] irix_setcontext(%p)\n",
 752                current->comm, current->pid, ctx);
 753 #endif
 754
 755         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 756                 goto segv_and_exit;
 757
 758         err = __get_user(flags, &ctx->flags);
 759         if (flags & 0x02) {
 760                 /* XXX sigstack garbage, todo... */
 761                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 762         }
 763
 764         if (flags & 0x04) {
 765                 int i;
 766
 767                 /* XXX extra control block stuff... todo... */
 768                 for (i = 1; i < 32; i++)
 769                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 770                 err |= __get_user(regs->lo, &ctx->regs[32]);
 771                 err |= __get_user(regs->hi, &ctx->regs[33]);
 772                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 773         }
 774
 775         if (flags & 0x08)
 776                 /* XXX fpu context, blah... */
 777                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 778
 779         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 780         if (err)
 781                 goto segv_and_exit;
 782
 783         /*
 784          * Don't let your children do this ...
 785          */
 786         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
 787                 do_syscall_trace(regs, 1);
 788         __asm__ __volatile__(
 789                 "move\t$29,%0\n\t"
 790                 "j\tsyscall_exit"
 791                 :/* no outputs */
 792                 :"r" (&regs));
 793                 /* Unreached */
 794
 795 segv_and_exit:
 796         force_sigsegv(SIGSEGV, current);
 797 }
 798
 799 struct irix_sigstack {
 800         unsigned long sp;
 801         int status;
 802 };
 803
 804 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 805         struct irix_sigstack __user *old)
 806 {
 807 #ifdef DEBUG_SIG
 808         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 809                current->comm, current->pid, new, old);
 810 #endif
 811         if (new) {
 812                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 813                         return -EFAULT;
 814         }
 815
 816         if (old) {
 817                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 818                         return -EFAULT;
 819         }
 820
 821         return 0;
 822 }
 823
 824 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 825
 826 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 827                                 struct irix_sigaltstack __user *old)
 828 {
 829 #ifdef DEBUG_SIG
 830         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 831                current->comm, current->pid, new, old);
 832 #endif
 833         if (new)
 834                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 835                         return -EFAULT;
 836
 837         if (old) {
 838                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 839                         return -EFAULT;
 840         }
 841
 842         return 0;
 843 }
 844
 845 struct irix_procset {
 846         int cmd, ltype, lid, rtype, rid;
 847 };
 848
 849 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 850 {
 851         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 852                 return -EFAULT;
 853 #ifdef DEBUG_SIG
 854         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 855                current->comm, current->pid,
 856                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 857                sig);
 858 #endif
 859         return -EINVAL;
 860 }